Character sketch warm up

So I've been thinking about making attempts to improve my life drawings skills for a while now, so I figured; what better time! I've wanted to be able to catch the 'essence' of peoples personalities with a few simple lines for many many years. So I took some pictures of my friends and went to work. See if you can guess who's who! Ha! I've got a long way to go, but it's the starting that's important. You can also chart my progress through the night on this one sheet; the drawings go from appalling to a bit better as I warm up, then back to crappy as I get tired.